Heuchera plant named ‘Carnival Silver Streak’

ABSTRACT

A new and distinct cultivar of  Heuchera  plant named ‘Carnival Silver Streak’, characterized by its dark greyed purplish-green and silver colored foliage, greyed yellow and green colored flowers, and moderately vigorous, mounded growth habit, is disclosed.

Latin name of genus and species of plant claimed: Heuchera×hybrida.

Variety denomination: ‘Carnival Silver Streak’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Heuchera plant botanically known as Heuchera×hybrida and hereinafter referred to by the cultivar name ‘Carnival Silver Streak’.

The new cultivar originated in a controlled breeding program in Elburn, Ill. during May 2009. The objective of the breeding program was the development of Heuchera cultivars with unique foliage coloration and mounded growth habit.

The new Heuchera cultivar is the result of cross-pollination. The female (seed) parent of the new cultivar is the proprietary Heuchera×hybrida breeding selection coded 198-2b, not patented, characterized by its dark purple and silver colored foliage, white-colored flowers, and moderately vigorous, mounded growth habit. The male (pollen) parent of the new cultivar is the proprietary Heuchera×hybrida breeding selection coded 191-12b, not patented, characterized by its dark green and silver colored foliage, greenish-white colored flowers, and vigorous, mounded growth habit. The new cultivar was discovered and selected as a single flowering plant within the progeny of the above stated cross-pollination during February 2010 in a controlled environment in Elburn, Ill.

Asexual reproduction of the new cultivar by in vitro propagation since February 2010 in West Chicago, Ill. has demonstrated that the new cultivar reproduces true to type with all of the characteristics, as herein described, firmly fixed and retained through successive generations of such asexual propagation.

SUMMARY OF THE INVENTION

The following characteristics of the new cultivar have been repeatedly observed and can be used to distinguish ‘Carnival Silver Streak’ as a new and distinct cultivar of Heuchera plant:

-   -   1. Dark greyed purplish-green and silver colored foliage;     -   2. Greyed yellow and green colored flowers; and     -   3. Moderately vigorous, mounded growth habit.

Plants of the new cultivar differ from plants of the female parent primarily in having foliage with a darker green-colored venation area. Plants of the new cultivar differ from plants of the male parent primarily in having foliage with a darker purple-colored venation area and reduced growth vigor.

Of the many commercially available Heuchera cultivars, the most similar in comparison to the new cultivar is ‘Amethyst Myst’, not patented. However, in comparison, plants of the new cultivar differ from plants of ‘Amethyst Myst’ in at least the following characteristics:

-   -   1. Plants of the new cultivar have foliage with more silver         coloration than plants of ‘Amethyst Myst’; and     -   2. Plants of the new cultivar have a flower color different from         plants of ‘Amethyst Myst’.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photographs show, as nearly true as it is reasonably possible to make the same in color illustrations of this type, typical flower and foliage characteristics of the new cultivar. Colors in the photographs differ slightly from the color values cited in the detailed description, which accurately describes the colors of ‘Carnival Silver Streak’. The plants were grown in one-gallon containers for approximately one year in a greenhouse in West Chicago, Ill.

FIG. 1 illustrates a side view of the overall growth habit of ‘Carnival Silver Streak’.

FIG. 2 illustrates a close-up view of an individual inflorescence of ‘Carnival Silver Streak’.

FIG. 3 illustrates a close-up view of an individual leaf of ‘Carnival Silver Streak’.

DETAILED BOTANICAL DESCRIPTION

The new cultivar has not been observed under all possible environmental conditions to date. Accordingly, it is possible that the phenotype may vary somewhat with variations in the environment, such as temperature, light intensity, and day length, without, however, any variance in genotype.

The chart used in the identification of colors described herein is The R.H.S. Colour Chart of The Royal Horticultural Society, London, England, 2007 edition, except where general color terms of ordinary significance are used. The color values were determined in May 2012 under natural light conditions in West Chicago, Ill.

The following descriptions and measurements describe plants produced from in vitro plantlets and grown in a glass-covered greenhouse under conditions comparable to those used in commercial practice. The plants were grown in West Chicago, Ill. in one-gallon containers for approximately one year utilizing a soilless growth medium. Greenhouse temperatures were maintained at approximately 70° F. to 77° F. (21° C. to 25° C.) during the day and approximately 65° F. to 68° F. (18° C. to 20° C.) during the night. Greenhouse light levels of 2,500 footcandles to 6,000 footcandles were maintained during the day. Measurements and numerical values represent averages of typical plants.

-   Botanical classification: Heuchera×hybrida cultivar Carnival Silver     Streak. -   Parentage:     -   -   Female parent.—Proprietary Heuchera×hybrida breeding             selection coded 198-2b, not patented.         -   Male parent.—Proprietary Heuchera×hybrida breeding selection             coded 191-12b, not patented. -   Propagation:     -   -   Type.—In vitro propagation is preferred, divisions are             possible.         -   Time to initiate roots in vitro.—Approximately 10 days at             20° C.         -   Time to initiate roots in greenhouse.—Approximately 20 days             at 20° C.         -   Time to produce a rooted plantlet in summer.—Approximately             42 days.         -   Root description.—Fine, fibrous; white to ivory in color.         -   Rooting habit.—Freely branching. -   Plant description:     -   -   Commercial crop time.—Approximately 20 weeks from a rooted             tissue culture plantlet to finish in a 1 gallon container.         -   Growth habit and general appearance.—Clump-forming             herbaceous perennial, mounded foliage.         -   Growth rate.—Moderately vigorous.         -   Outdoor plant performance.—Use as bedding plants or in             mixed-container plantings; at least tolerant to temperatures             up to 35° C. and hardy to USDA zone 3.         -   Size.—Height from soil level to top of plant plane:             Approximately 90.0 cm. Height from soil level to top of             foliage: Approximately 16.0 cm. Width: Approximately 51.0             cm.         -   Branching habit.—No branching, basal rosettes of leaves on             petioles. Number of rosettes per plant: Approximately 12. -   Foliage description:     -   -   General description.—Moderately durable to environmental             stresses. Quantity of leaves per rosette: Approximately 8.             Fragrance: None. Form: Simple. Arrangement: Alternate.         -   Leaves.—Aspect: Blade is nearly perpendicular to petiole.             Shape: Orbicular. Margin: Crenate, shallowly lobed. Apex:             Broadly acute. Base: Cordate, sometimes moderately             overlapping. Venation pattern: Palmate. Length of mature             leaf: Approximately 12.5 cm. Width of mature leaf:             Approximately 12.5 cm. Texture of upper surface: Dull,             slightly rough, sparsely pubescent with short hairs. Texture             of lower surface: Slightly glossy, moderately pubescent with             short hairs. Color of upper surface of young foliage:             Closest to 202C with an overlay of 187A and venation area             and margins of closest to N186A. Color of lower surface of             young and mature foliage: N186D. Color of upper surface of             mature foliage: Closest to N189D with venation area and             margins of closest to but greener than N186A, transitions             with age to closest to 198D with venation area and margins             of N137A.         -   Petiole.—Length: Approximately 17.0 cm. Diameter:             Approximately 3.0 mm. Texture: Moderately pubescent with             short hairs. Color: N186C to N186D.         -   Stipules.—Two leafy stipules located at the base of each             petiole. Apex: Narrow acute. Length: Approximately 1.5 cm.             Width: Approximately 5.0 mm. Color: N186D. -   Flowering description:     -   -   Flowering habit.—‘Carnival Silver Streak’ flowers once a             year during late spring to midsummer under outdoor             conditions.         -   Lastingness of individual flower on the plant.—Approximately             7 days. -   Inflorescence description:     -   -   General description.—Type: Compound spike emerging from the             base of the rosette with two to three cauline leaves.             Fragrance: None. Length or height excluding the peduncle:             Approximately 30.0 cm. Width: Approximately 11.0 cm.             Quantity of inflorescences per plant: Approximately 35.             Quantity of flowers per inflorescence: Approximately 70.         -   Peduncle.—Strength: Moderate. Aspect: Erect to approximately             30° angle from vertical. Length: Approximately 58.0 cm.             Diameter at midpoint: Approximately 3.0 to 4.0 mm. Texture:             Moderately pubescent with short hairs. Color: N137A with a             heavy overlay of 187A. -   Flower description:     -   -   General description.—Type: Single, campanulate,             self-cleaning. Aspect: Drooping to slightly outward.         -   Bud.—Rate of opening: Generally takes 4 days for bud to             progress from first color to fully open flower.         -   Bud just before opening.—Shape: Broadly obovate. Length:             Approximately 4.0 mm. Diameter: Approximately 3.0 mm.             Texture: Densely glandular pubescent. Gland Color: 61A.             Color: Closest to 161D with 187D at base.         -   Corolla.—Shape: Campanulate. Diameter: Approximately 4.0 mm.             Depth: Approximately 5.0 mm.         -   Petals.—Quantity: 5. Arrangement: Single whorl. Shape:             Narrowly elliptic. Appearance: Dull. Margin: Entire. Apex:             Acute. Base: Lower half fused into hypanthium. Length:             Approximately 5.0 mm. Width: Approximately 1.0 mm. Texture             of upper surface: Glabrous. Texture of lower surface:             Densely glandular pubescent. Gland Color: 61A. Color of             upper and lower surfaces when first and fully open: 161D             with an overlay of 55A.         -   Calyx.—Shape: Campanulate. Diameter: Approximately 4.0 mm.             Depth: Approximately 5.0 mm.         -   Sepals.—Quantity per flower: 5. Shape: Elliptic. Appearance:             Dull. Margin of free portion: Entire. Apex: Acute. Base:             Lower half fused into hypanthium. Length: Approximately             5.0 mm. Width at rim of hypanthium: Approximately 2.0 mm.             Texture of upper surface: Glabrous. Texture of lower             surface: Densely glandular pubescent. Gland Color: Mixture             of 187A and N186A. Color of upper surface: 145D with 137A at             tip. Color of lower surface: Closest to 161D with 145B at             base and 137A at tip.         -   Pedicel.—Strength: Moderate. Aspect: The pedicel of the             central flower of each spikelet is directly on top of the             secondary pedicel, pedicels of secondary and tertiary             flowers of each spikelet have an average 40° angle from             vertical. Length: Approximately 2.0 mm. Diameter: Less than             1.0 mm. Texture: Densely glandular pubescent. Gland color:             187A. Color: N137A with a heavy overlay of 187A.         -   Reproductive organs.—Androecium: Quantity: 5 per flower.             Anther shape: Ovate. Anther length: Approximately 1.0 mm.             Anther color: N25A. Filament length: Approximately 1.0 mm.             Filament color: 145D. Pollen amount: None observed.             Gynoecium: Pistil quantity: 2 per flower. Pistil length:             Approximately 9.0 mm. Stigma shape: Pointed. Stigma color:             145A. Style length: Approximately 6.0 mm. Style color: 145D.             Ovary color: 144D. -   Seed and fruit production: Neither seed nor fruit production has     been observed. -   Disease and pest resistance: Resistance to pathogens and pests     common to Heuchera has not been observed. 

What is claimed is:
 1. A new and distinct cultivar of Heuchera plant named ‘Carnival Silver Streak’, substantially as herein shown and described. 